Add concert specials to the mix of talent contests, reality and game shows, and animated fare that will continue to be produced during the writers' strike. CBS said Monday that it had signed deals to air one-hour specials featuring Celine Dion and Garth Brooks. Presumably the two singers will use patter written for their stage shows long before the strike began. Dion's special was reportedly taped last Saturday in Los Angeles and is due to air on February 15; Brooks's show will be culled from an upcoming performance at the Staples Center in Los Angeles.